397969849 has 2 divisors, whose sum is σ = 397969850. Its totient is φ = 397969848.

The previous prime is 397969829. The next prime is 397969907. The reversal of 397969849 is 948969793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252333225 + 145636624 = 15885^2 + 12068^2 .

It is a cyclic number.

It is not a de Polignac number, because 397969849 - 2⁷ = 397969721 is a prime.

It is not a weakly prime, because it can be changed into another prime (397969829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198984924 + 198984925.

It is an arithmetic number, because the mean of its divisors is an integer number (198984925).

Almost surely, 2^397969849 is an apocalyptic number.

It is an amenable number.

397969849 is a deficient number, since it is larger than the sum of its proper divisors (1).

397969849 is an equidigital number, since it uses as much as digits as its factorization.

397969849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26453952, while the sum is 64.

The square root of 397969849 is about 19949.1816624141. The cubic root of 397969849 is about 735.5576615309.

The spelling of 397969849 in words is "three hundred ninety-seven million, nine hundred sixty-nine thousand, eight hundred forty-nine".